1990 Bronco 2 rarely starts on the first crank...always 2nd attempt.

[mr_manny]

I replaced the fuel filter this morning, and was surprised the fuel system wasn't pressurized.
After replacing the filter and checking for leaks, I wondered if the lack of pressure was normal.

How often does the fuel system remain pressurized when not in use?

Also wondering if this lack of pressure could be the contributing to needing to crank a 2nd time.

I'm still going though my new to me bronco II, so I can't provide any historical info.
Thanks in advance.

 

[Brain75]

a quick search on here (TRS), and the most common thing is the fuel pressure regulator can go bad without any symptoms.

2.9 Dosent hold fuel pressure

Hey guys. My truck wont start quickly these days unless i turn the ignition from off to run about 6 times on and off cycling the fuel pump. otherwise i would just sit there on the starter. Its an 89, the fuel pump is newer i replaced it myself, it always worked great after i replaced it. I also...

www.therangerstation.com

 

[mr_manny]

Just wanted to clarify:
Something isn't right, since my fuel system isn't holding static fuel pressure.

 

[Brain75]

well from that thread, the two main culprits are the check valve in the fuel pump (clean/replace fuel pump) and the fuel pressure regulator (look for wet on the wrong side - vacuum side, but that isn't definite).... FPR is quick and easy to get to but not soo cheap (~ $75 here in the states)

Pulling the pump is a lot more work, and I have not torn a pump down to the little bits looking at the internals for the check valve.

If you replace the pump, let me suggest you get a bosch pump and replace only the pump on the sending unit - all the other sending units are cheap crap and the oem one will last forever. The only issue with the oem one is the brass float might develop a pinhole and fill full of gas, it is easy to drain and diagnose (pull vacuum on it while underwater and look for bubbles), and fix with a soldering iron.

 

[mr_manny]

Thanks for your reply, especially regarding replacement units.
I do have a complete sending unit/pump in my cart at amazon

Do you happen to know the model number of the compatible bosch pump?

 

[Brain75]

quick lookup on bosch's page and they list 3 all look identical in the picture

https://www.boschautoparts.com/products?baseVehicleId=5517&engineBlockType=V&engineCyl=6&fuelTypeId=5&engineLiter=2.9&VehicleTypeGroupId=2

67037
68012
69101

might look on partsgeek/rockauto/amazon with those numbers and "check fit" to verify what they think will fit the best. might have to call bosch to eliminate or confirm they are 3 different identical (the 69101 does say "OE Upgrade Unit" in the description...

 

[mr_manny]

Thank You

 

[mr_manny]

Tested the fuel pressure today.
Steady at 30lbs, increasing to 40lbs when I rev up the motor.

Also tested an oil-pressure gauge, as a fuel gauge...it works

After shutting off the engine, fuel pressure drops to ZERO after a few hours.

 

[mr_manny]

Oil sending unit started to leak.
Guess it isn't rated for fuel, or because it's from china.

Back to the analog it is

 

[Terrys87]

I am battling the same issue on my 88. Seems to help if I cycle the key twice before starting to allow for the 2 sec priming. I have changed the FPR a couple of times. I did change my map/maf sensor for another issue, and it did seem to help a small amount. I really don't think that was the issue as far as starting, I am not sure. I am eventually do the single pump upgrade to a higher pressure pump and remove the reservoir and the plastic canister on mine as the plastic is getting very fragile. It will be a week or two before I get it done and will post my results.

 

[alwaysFlOoReD]

Fuel pressure should hold for months... If not there is a leak somewhere.

 

[SenorNoob]

Not saying your wrong, but that seems a little much to ask of a 30+ year old truck. I'd be happy with overnight.

 

[mr_manny]

My new to me b2 runs fine, just routinely requires a few more cranks then I would like to start.
Since I have to pull the tank (fuel indicator not working and fill-tube leaking), I'll replace the fuel pump with a Bosch unit.
Keep you guys posted.